2005 polaris sportsman 500 not charging

jeremy · #1 (**permalink**) 09-07-2010, 05:32 PM

Here is what I havefound so far
Battery overcharging @ 4000+ RPMS, battery light flashing pushing 17 volts
Have 57/60 from magneto
Have 12 @ the rectifier any ideas?

Also found the post on the top of the starter is loose ( would this cause all the electrical issues?

**Bruce!** · #2 (**permalink**) 09-07-2010, 06:11 PM

Welcome to the board!

HARDC0RE33 · #3 (**permalink**) 09-13-2010, 05:40 PM

Hey Jeremy,

I just joined the group today and am having the same problem.
I also have a 2005 Polaris Sportsman 500HO.
I tried 2 new batteries and both died.
I have replaced the ECM (silver box below the head light) because its a recall part.
ECM is the electronic control modual which obviously controls all electrical.
Got it free from the dealer. Thought forsure this would be it but no go.
Battery light came on after running 15 mins with head lights on. Even without
the head lights on my bike will still drain the battery.
If I or you find anything out lets pass it on please.
Cheers and good luck.

thecatz33 · #4 (**permalink**) 10-11-2010, 05:13 PM

Hi guys, I also have a 2005 Polaris Sportsman 500 H.O. and I'm having the exact same charging/electronic issues as you guys, still trying to figure it out...any input/solution will be greatly appreciated! Thanks

jeremy · #5 (**permalink**) 08-23-2011, 12:13 PM

have any of you found the charging problem?
Still the same issue

battery is good
ECM is good
Output from stator is as per specs

Battery is still overcharging to 17.5 volts
however the battery does not lose it's charge anymore.
SOOOOOOOOO confused

moosetracker · #6 (**permalink**) 08-30-2011, 09:11 PM

i had the same issues and the dealership thought it was the ECM but it turned out to be the stator. its the peak output that you cant measure thats why everything appears to work with the stator.